YAA	Yet Another Acronym
YAB	Yet Another Blog
YAC	Yards After Catch
YAC	Yeast Artificial Chromosome
YAD	You Are Dead
YAE	Yet another Apple II Emulator
YAF	Yankee Air Force
YAG	Yttrium Aluminum Garnet
YAH	You Are Here
YAI	Yet Another Interview
YAJ	You Are Joking
YAK	Year Ten [!] Thousand [!]
YAL	Yemeni American League
YAM	Yet Another Mailer
YAM	Yet Another Mistake
YAM	Yet Another Modem
YAN	Yes And No
YAN	Yet Another NAS
YAO	Youth Action Online
YAP	Yahoo Application Platform
YAP	Yet Another Platform
YAP	Yet Another Proxy
YAQ	Yet Another Question
YAR	Young Adult Representative
YAS	Youth After School
YAT	Yet Another TLA
YAT	Youth Asociation Team
YAU	Youth Affairs Unit
YAV	Yuppie Assault Vehicle
YAW	Yet Another Weblog
YAW	You're A Wanker
YAY	Yet Another YACC
YBA	Young Buddhist Association
YBB	You've Been Beaten
YBC	Yttrium-Barium-Copper
YBD	You Back Down
YBE	Yearly Basic Exemption
YBF	You've Been Framed
YBG	Youth Baseball Glove
YBH	You've Been Had
YBI	Youth Business International
YBJ	Youth Bowl Japan
YBK	Why Be Killed [!]
YBL	You've Been Lazy
YBM	YouthBuild McLean
YBN	Young Blood Needed
YBO	Young Bucks Outdoors
YBP	[Coalition of] Young Black Professionals
YBR	Yellow Brick Road
YBS	Your Big Sister
YBU	Yellow Book Update
YBW	Yachting and Boating World
YBX	Young Brothers' eXchange
YBY	Yarmouth Boat Yard
YCA	Yokogawa Corporation of America
YCB	Youth Coordinating Board
YCC	Youth Conservation Corps
YCD	Youth Community Development
YCE	You Can't Enter
YCF	Yankee Critical Facility
YCG	Young Carmelite Group
YCH	Youth Crisis Hotline
YCI	Youth Challenge International
YCJ	Young Champions for Jesus
YCL	Young Communist League
YCM	Youth Council of Montenegro
YCN	Youth Challenge Network
YCO	York College Observatory
YCP	Youth Collaboration Project
YCQ	Yacht Club of Quebec
YCR	Youth Council Representative
YCS	You Can't be Serious
YCT	You Can't Type
YCU	Yard Craft, Utility
YCV	Youth Council Voice
YCW	You Can't Win
YCX	Youth Club eXtreme
YCY	Youth Council of Yugoslavia
YCZ	Youth for Christ Zimbabwe
YDA	Young Democrats of America
YDB	Yamaha Drum Bag
YDC	Youth for Development and Co-operation
YDD	Youth Development Department
YDE	Youth Development through Employment
YDF	Youth Deliberative Forum
YDG	Yard De-Gaussing vessel
YDI	Young Design, Incorporated
YDI	Youth Development International
YDJ	Youth Development Journal
YDK	You Don't Know
YDL	YAMI Definition Language
YDL	Yellow Dog Linux
YDL	Youth Development Leadership
YDM	You Da Man
YDN	Youth Development Network
YDO	Youth Development Officer
YDP	Youth Development Program
YDQ	Your Daily Quiz
YDS	Young Democratic Socialists
YDT	Yardcraft, Diving Tender
YDT	Yukon Daylight Time
YDU	You Don't Understand
YDV	Young Dumb and Violent
YDW	Youth Development Worker
YDY	Youth Defending Youth
YDZ	Youth Development Zone
YEA	Youth Environmental Associates
YEB	Young Entrepreneurs at Berkeley
YEC	Youth Evangelical Conference
YED	Yeovil Electronic Developments, Limited
YEE	Youth and Environment Europe
YEF	Young Engineers Forum
YEG	Youth Experiencing God
YEH	Youth Enterprise Hub
YEI	Youth for Energy Independence
YEJ	Youth Encounter Jesus
YEK	Youth Entrepreneurs of Kansas
YEL	YEL Electronics Limited
YEM	Youth Empowerment Mission
YEN	Youth of European Nationalities
YEO	Your Eyes Only
YEP	Youth Empowerment Project
YEQ	Young Engineers Queensland
YER	Youth En Route
YES	Young Engineers Society
YES	Young Enterprise Schotland
YES	Young Epidemiology Scholars
YES	Your Extertainment Spot
YES	Youth Education Series
YES	Youth Employability Support
YET	You're Eligible, Too
YEU	Yukon Employees Union
YEV	Yazaki EDS Vietnam, Ltd.
YEW	Youth Encounter Weekend
YEX	Youth EXchange
YEY	Young Engineer of the Year
YEZ	Youth Enterprise Zone
YFA	Youth For Achievements
YFB	Youth For Boost
YFC	Young Farmers' Club
YFD	Yard Floating Drydock
YFE	Youth For Europe
YFF	Your Friend Forever
YFG	Young Fine Gael
YFH	Youth For Health
YFI	Youth and Family Institute
YFJ	Youth For Justice
YFL	Youth For Life
YFM	Youth and Family Ministry
YFN	Young Feminist Network
YFO	Youth Forum Online
YFP	Youth For Peace
YFQ	Yet another Fair Queuing
YFR	Youth Fellowship Rally
YFS	Yachts For Sale
YFT	Youth Facilitator Team
YFV	Yellow Fever Virus
YFW	Youth For Work
YFX	Youth Field Xpress
YFY	Youth For Youth
YFZ	Youth Forum Zambia
YGA	Yorkshire Game Angling
YGB	Youth Group Band
YGC	Youth Gone Crazy
YGD	Youth Gubernatorial Debate
YGE	Youth Grantmaking Entity
YGF	You Go First
YGG	Youth Garden Grant
YGH	Youth Guest House
YGI	Youth Garden Internship
YGK	Yamato Gate Keepers
YGL	Yilgarn Gold Limited
YGM	You've Got Mail
YGN	Young Generation Network
YGO	Yagi Genetic Optimizer
YGP	Your Golf Professional
YGR	Young Game Reviewer
YGS	Youth Gang Survey
YGT	Young Graduate Trainee
YGU	Yamanashi Gakuin University
YGV	Yorkshire Gay Vegetarians
YGW	Young Georgia Writers
YHA	Youth Hostels Association
YHB	Youth Health Breaks
YHC	Young Harris College
YHD	Your Home Doctor
YHE	Yale Hook & Eye Company
YHF	Ypsilanti Heritage Foundation
YHG	Young Homelessness Group
YHH	Yosemite Highway Herald
YHI	Youth Health Initiative
YHJ	Young Horse Jumper
YHL	You Have Lost
YHM	Yankee Hill Machine Company, Inc.
YHM	You Have Mail
YHN	Your Humble Narrator
YHO	Youth Hostel Organisation
YHP	Your Home Page
YHQ	Yokogawa HeadQuarters
YHR	Yakima Herald-Republic
YHS	Yorktown High School
YHS	Your Humble Servant
YHV	Yellow-Head Virus
YHW	Your HomeWork
YHX	Youth Hospitality eXchange
YHY	Youth Helping Youth
YIA	Youth In Action
YIB	Years In Business
YID	Y-Input Data
YIE	Yankee Invention Exposition
YIF	Your Incredible Future
YIG	Yttrium Iron Garnet
YII	Yes It Is
YIJ	Young Indiana Jones
YIL	Yahoo! Internet Life
YIM	Yahoo Instant Messenger
YIM	Youth In Ministry
YIN	Youth Intervention Network
YIO	Youth Involvement Ontario
YIP	Young Inventors Program
YIQ	Youth Interplay Queensland
YIR	Year In Review
YIT	Youth In Transition
YIU	Youth Issues Unit
YIV	Youth Internet Volunteer
YIW	Youth In Wilderness
YIX	Yahoo! Internet eXchange
YIY	Yoga Is Youthfulness
YIZ	Youth In Zambia
YJA	Young Jains of America
YJB	Youth Justice Board
YJC	Young Jewish Care
YJE	Yale Jazz Ensemble
YJH	Yale Junior High
YJI	Yong Jin Industrial Company
YJJ	Yale Judaica Journal
YJK	Young Jedi Knight
YJL	Young Jewish Leadership
YJN	Young Jedi Niagara
YJO	Youth Jazz Orchestra
YJP	Young Jewish Professional
YJQ	Yellow Jacket Quadrangular
YJR	Youth Justice Renewal
YJS	Youth Justice Services
YJT	Youth Justice Team
YJU	Youth Justice Unit
YJV	Youth-Junior Volleyball
YJX	Young Jewish eXperience
YJZ	Yellow Jacket Zone
YKC	Yale Kendo Club
YKD	Yukon-Kuskokwim Delta
YKH	Yung Kong Holdings
YKM	You're Kidding Me
YKN	Yukon, Kuskokwim, and Norton Sound
YKR	Yalu King Ranch
YKS	Yamashita Karate Studio
YKT	Yeast Killer Toxin
YKU	Young Koreans United
YKW	You Know Who
YKY	Young Kettle's Yard
YLA	Youth Leadership Academy
YLB	Youth League Baseball
YLC	Youth Leadership Conference
YLD	[ABA] Young Lawyers Division
YLE	Young Learners English
YLF	Youth Leadership Forum
YLG	Youth Libraries Group
YLH	Your Logo Here
YLI	Youth Leadership Institute
YLJ	Youth Leadership Jacksonville
YLL	Young Labor Left
YLN	Yorkshire Library News
YLO	Youth Leadership Omaha
YLP	Yosemite Lakes Park
YLR	Youth Leader Retreat
YLS	Youth Leadership Seminar
YLT	Youth Leadership Training
YLU	Youth Leaders University
YLX	Youth Leadership eXchange
YLZ	You LoZe
YMD	Year, Month, Date
YOB	Year Of Birth
YOS	Yoper Operating System
YOS	Your Operating System
YOU	YaST Online Update
YOY	Year-On-Year
YPC	YaBB Password Center
YPC	Yeast PathCalling
YPC	Yelverton Paperweight Centre
YPC	Yerevan Press Club
YPC	Yorkshire Paintball Centre
YPC	Young Parents Center
YPC	Young People's Centre
YPC	Young People's Chorus
YPC	Young People's Congregation
YPC	Young Peoples Concerts
YPC	Young Professionals Committee
YPC	Young Professionals Connection
YPC	Young Professionals for Children
YPC	Young Professionals of Chicago
YPC	Young Pysicists' Conference
YPC	Youth, Power and Change
YPC	Yukon Pacific Corporation
YPM	Yes Prime Minister
YPS	Yoyodyne Propulsion Systems
YRO	Your Rights Online
YRS	Ysgarth Rules System
YSL	Young, Sexy, Lovely
YSL	Yves Saint Laurent
YSM	Yourdon Structured Method
YSO	Young Stellar Object
YST	Yukon Standard Time
YTD	Year To Date
YTY	Year To Year
YUI	Yahoo! User Interface [Library]
YUM	Yellow Dog Updater Modified
YUP	Young Urban Professional
YVO	Yellowstone Volcano Observatory
YXK	Year Ten [!] Thousand [!]